Quote:
Originally Posted by Chas H
Sure it does. The current flows out the center and across the gap of one spark plug, through the block, and then from the side electrode across the gap to the center of the other plug. It's a big circle.
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Chas, I believe you and whipple are both correct. Though the current flows in a big circle across two plugs, 80% of the spark energy is used in the compressed cylinder. It has to do with the difference in environment around the gap.